Operation
0525−1/A1
Winterthur Gas & Diesel Ltd.
1/ 3
Faults in Servo Oil System
1. Defective Servo Oil Pump
1.1 Identification
The flow sensors FS2061A and FS2062A show that a servo oil pump does not supply
oil, i.e. an alarm is activated in the alarm and monitoring system (Servo oil pump
No. 1 or No. 2 no flow).
1.2 Causes
D The servo oil pump has damage.
D The safety device on the pump drive has sheared.
D The actuators CV7221C and CV7222C are defective.
D There is no control current (the cable coupling is defective).
1.3 Procedure
If one servo oil pump becomes defective, the engine can operate through the full load
range.
CAUTION
Damage Hazard: Do not operate the engine with one
unserviceable servo oil pump for a long period. If the other servo
oil pump becomes defective, damage can occur and the engine
cannot operate.
1) Replace the defective servo oil pump as soon as possible (see the Maintenance
Manual 5551−2 Supply Unit).
2. Defective Exhaust Valve Control Unit
2.1 Identification
D The engine control system (ECS) gives an alarm indication (see 4002−2,
paragraph 3.15 Log Messages).
D The fuel injection is cut out automatically (Inj. CUT OFF) on the related cylinder,
and a slow down signal is released.
D The level switch LS3444A activates an alarm because there are leakages in the
hydraulic pipes to the exhaust valves (see 8016−1 Lubricating oil system,
paragraph 4 Servo Oil Leakage).
2.2 Causes
D The 4/2-way valve on the exhaust valve control unit (VCU) is defective.
D The piston in the VCU, or the valve cannot move.
D A hydraulic pipe to the exhaust valve is broken.
2.2.1 4/2-way Valve − Replace
Replace the defective 4/2-way valve on the VCU as soon as possible.
1) Stop the engine.
2) Make sure that the servo oil service pump is set to off.
3) Set to off the main bearing oil supply.
4) Carefully open the screw plug (3, Fig. 1) to release the pressure in the servo oil
rail (2). Make sure that the servo oil rail has no pressure.
5) Disconnect the electrical connection (7).
6) Remove the four screws (5) together with the 4/2-way valve (6).
2014
Operation during Unusual Conditions
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